We need your telephone number if your email address is incorrect, or somehow undeliverable.
About 20% of the time, we reply to an email and the recipient does not receive it. About half of those come back as "undeliverable".
Many ISPs, including AOL, Comcast, Charter, Earthlink, and MSN automatically block valid emails to their clients.
When this happens, without your telephone number, we cannot be of assistance.
Therefore, we no longer take the time to answer emails unless we have a valid telephone number as well.